Alright pretty sure it's green dust algae. I was like... I've had red cyano in the reef and this ain't nothing like that (My snails destroy this stuff but can't keep up). Did have a bit of BGA on my...

The algae is green slime algae over the glass, I did manage to get it off of my fake plants with just the excel and hydrogen peroxide cleaning. Would I still be able to spot treat like you said with...

Do a major water change, 50% and match salinity and temp. as close as possible. This will not disturb the livestock. Change the bulbs too, the spectrum shifts when they get older to favor pest algae...